Looks like the watch frozen because of shorrt time lost of the contact on the battery. In this case you just need to extract the battery and put it again after 10 seconds or so to make full hardware reset.Well, a little over 24 hours with mine and it's broken. I was fiddling with the bracelet and it fell about a foot onto a carpeted surface, and now it looks like the module is busted.
If the watch is still working but some segments are not working -- unfotunately, most probably is that the LCD panel is broken. I can send you a spare one, or you can send back the watch or the module for repair, of course. In any case you can PM me about this repair.